code: def test_tracker_locking(self):
      class BadLayer(layers.Layer):
          def call(self, x):
              self.w = self.add_weight(initializer="zeros", shape=())
              return x
  
      layer = BadLayer()
      with self.assertRaisesRegex(
          ValueError,
          "cannot add new elements of state",
      ):
          layer(np.random.random((3, 2)))
  
imports: import numpy
  import pytest
  from keras import backend
  from keras import layers
  from keras import metrics
  from keras import models
  from keras import ops
  from keras import testing
label_desc: Use image node_id 17 for calling the LayerTest obj's underlying member method code with example usage: obj.test_tracker_locking() and returns: x